soaker pad

noun3

1. •
   A waterproof mattress topper, especially one intended for urine (i.e. unpotty-trained or incontinence); a bed protector.

   • A soaker pad can be placed under the infant so that it and not the blanket absorbs the overflow urine. — 1997
2. •
   A diaper insert, especially a booster pad.

   • BEST FOR BABY because it has a soaker pad of self-material in Red Star; Birdseye diaper material and heavy flannel […] — 1955
3. •
   Synonym of meat pad (“an absorbent pad placed underneath raw meat in order to absorb excess moisture and fluids (like blood) so as to prevent the buildup of harmful bacteria”).

   • I'm going to check to make sure that only 0.78 pounds of meat is actually in there. Just the meat, not the wrapping, not the tray, not the soaker pad on the inside. — 2020